|Born on||1 July 1881 in Vouziers, Ardennes (08), Grand-Est, France, Europe|
|Deceased on||25 November 1976 in Paris, Ile-de-France, France, Europe|
|Father-in-law of||Jean Kérisel|
|Place(s) of activity:|
Studies at the Ecole polytechnique in the corps of bridges, graduates with Eugène Freyssinet
Employed by Armand Considère in his office
After Considère's death, the office becomes Pelnard-Considère & Caquot
|1928 - 1933||
General Director of the new Air Traffic Ministry
Elected to the French Academy of Sciences
President of the French Academy of Sciences
Structures and Projects
Participation in the following structures & large-scale projects:
- Caille Bridge
- Donzère-Mondragon Bridge
- Donzère-Mondragon Canal Bridge
- Girotte Dam
- Groléjac Bridge
- La Roche-Posay Bridge
- Le Sautet Bridge
- Le Sautet Dam
- Lukuga River Bridge - Pelnard, Considère et Caquot
- Ponsonnas Bridge
- Pont de l'Isle
- Pont de la Jonelière
- Pont du Fleix
- Pont Jacques-Boulloche - Caquot & Brocard
- Saint-Just-Saint-Rambert Bridge
- Waville Viaduct
Biography from Wikipedia
Albert Irénée Caquot (1 July 1881 – 28 November 1976) was considered as the "best living French engineer" during half a century. He received the “Croix de Guerre 1914–1918 (France)” (military honor) and was Grand-croix of the Légion d’Honneur (1951). He was a member of the French Academy of Sciences from 1934 till his death. In 1962, he was awarded the Wilhelm Exner Medal.
His parents, Paul Auguste Ondrine Caquot and wife Marie Irma (born Cousinard) owned a family farm in Vouziers, in the Ardennes, near the Belgian border. His father taught him modernism, by installing at their place electricity and telephone as early as 1890. One year only after high school, at eighteen years old, he was admitted at the Ecole Polytechnique ("year" 1899). Six years later, he graduated in the Corps des Ponts et Chaussées.
The scientist and designer
From 1905 to 1912, he was a project manager in Troyes (Aube), and was pointed out for major civil work improvements he undertook with the city sewer system. This protected the city from the centennial flood of the River Seine in 1910. In 1912, he joined a leading structural engineering firm where he applied his unique talent of structure designer.
Albert Caquot conducted outstanding research that was immediately applied in construction. His major contributions include:
- reinforced concrete design, and structural engineering in a broader sense. In 1930, he defined the intrinsic curve and explained why the elasticity theory was not sufficient any more for modern structures design.
- geotechnics and foundation design. He stated the corresponding states theorem (CST). In 1933, his publication on the stability of pulverulent and coherent material received an admiring report from the French Academy of Sciences, where he was elected life member in 1934. In 1948, with Jean Kérisel (1908–2005), his son-in-law and disciple, he developed an advanced theory extremely important for passive earth pressure (LINK) where there is soil-wall friction. This principle has been broadly applied ever since for the design of ground engineering structures such as retaining walls, tunnels and foundation piles.
- the revival of cable-stayed bridges with reinforced concrete (Donzère Mondragon bridge, 1952), which he envisioned with long spans, even crossing the English Channel. In 1967, he designed a conceptual double-deck bridge of this type with 810 m-wide spans and two 25 m-wide decks stages accommodating 8 lanes for cars, 2 for rail and 2 for skytrain.
In the course of his life, Albert Caquot taught mechanical science for a long time in three of the most prominent French engineering schools in Paris: Écoles nationales supérieures des Mines, des Ponts et de l’Aéronautique.
In the course of his career, as both a highly creative designer and a tireless calculator, he designed more than 300 bridges and facilities among which several were world records at the time:
- the La Madeleine Bridge, in Nantes (1928), a concrete cantilever bridge over the River Loire,
- the Lafayette Bridge crossing the tracks of the Gare de l’Est in Paris (1928). This is a struss bridge in reinforced concrete, where concrete vibrators using compressed air were used for the first time in history,
- the new La Caille Bridge (1928), on the ravine of Usses, in the Alps, close to Annecy. This is a 140-m-span concrete arc bridge,
- the great Louis Joubert dry dock (Normandie-Dock) in the port of Saint-Nazaire (1929–33),
- the La Girotte Dam (1944–49),
- the Bollène lock, on the left side (navigating downwards) of the Donzère-Mondragon Dam (built on the Donzère-Mondragon Canal, lateral to the Rhône river), the world's tallest lock (1950),
- the Bildstock tunnel (1953–1955),
- the world's largest tidal power plant on the River Rance, in Brittany (1961–1966). In his eighties, Albert Caquot made a critical contribution to the construction of the dam, designing an enclosure in order to protect the construction site from the 12-m-high ocean tides and the strong streams.
Two prestigious achievements made him famous internationally: the internal structure of the statue of Christ the Redeemer in Rio de Janeiro (Brazil) at the peak of Corcovado Mountain (1931) and the George V Bridge on the Clyde River in Glasgow (Scotland) for which the Scottish engineers asked for his assistance.
In his late eighties, he developed a gigantic tidal power project to capture the tide energy in Mont St Michel bay, in Normandy.
The aeronautical engineer
During the course of his life, he committed himself alternatively to structural and aeronautical engineering following the rhythm imposed by the First and Second World Wars. Albert Caquot's contributions to aeronautics are included the design of the “Caquot dirigible” and technical innovations at the new French Aviation Ministry, where he created several Fluid Mechanics Institutes that still exist today. Marcel Dassault, who was charged by Albert Caquot to develop several major aeronautical projects at the beginning of his career, wrote about him: "He was one of the best engineers that aeronautics ever had. He was visionary and ahead of his time. He led aeronautical innovations for forty years".
As early as 1901, already visionary, he performed his military service in an airship unit of the French army. At the beginning of First World War, he was mobilised with the 40e Compagnie d'Aérostiers equipped with Drachen type airships as first lieutenant. He noticed the poor wind behavior of these sausage shaped captive balloons, which were ineffective except in calm conditions.
In 1914, he designed a new sausage-shaped dirigible equipped with three air-filled lobes spaced evenly around the tail as stabilizers, and moved the inner air balloonette from the rear to the underside of the nose, separate from the main gas envelope. The Caquot was able to hold in 90 km/h winds and remain horizontal. During three years, France manufactured "Caquot dirigibles" for all the allied forces, including English and United States armies. The United States also manufactured nearly a thousand "Caquot R balloons" in 1918-1919. This balloon gave to France and its allies an advantage in military observation which significantly contributed to the allies’ supremacy in aviation and eventually to the final victory. In January 1918, Georges Clémenceau named him technical director of the entire military aviation. In 1919, Albert Caquot proposed the creation of the French aeronautical museum (today called Musée de l'Air et de l'Espace, in Le Bourget). This museum is the oldest aeronautical museum in the world.
In 1928, Albert Caquot became the first executive director of the new Aviation ministry. He implemented a policy of research, prototypes and mass production which contributed quickly to France leadership in the aeronautical industry. His main accomplishments are:
- the development of fluid mechanics research and education. He created in 1928 the Ecole Nationale Supérieure d’Aéronautique (Sup' Aero), the leading engineering school in aeronautics that contributed to French scientific excellence in aeronautics and led to the creation of several institutions like ONERA (National Office of Aerospace Studies and Research) in 1946 and the CNES (National Center of Space Studies) in 1952. The school still exists today.
- the construction of the gigantic Chalais-Meudon Wind Tunnel in 1929 (120 m-long and 25 m-high) allowing to test an aircraft in real conditions, with engine running and the pilot on board. This wind tunnel was the largest of the world at the time and it was used to test the Dassault Mirage III, the Sud Aviation Caravelle and the Concorde, but also cars like the Peugeot 4 CV and the VW Beetle.
In 1933, after a budget cut that prevented him from carrying forward his projects, he resigned and went back to structural engineering for several years.
In 1938, under the threat of the war, Albert Caquot was brought back to manage all the national aeronautical businesses. He resigned in January 1940.
He always had a great independence of mind and an incredible selflessness. The numerous honors he received from multiple countries, for example the dignity of Grand-croix de la Légion d’Honneur in France (1951), pay tribute to his exceptional merits. He was a member of the French Academy of Sciences for 41 years and served as their president from 1952 to 1961. During more than twenty years, he chaired numerous French scientific organizations, like the National Council of the French Engineers (CNISF), and was on the board of EDF (Électricité de France), the main electricity generation and distribution company in France, during more than ten years. In 1961, at 80 years old, Albert Caquot resigned from all the presidencies which he had always assured voluntarily. Warm-hearted, attentive and available, he loved to withdraw within his family.
On 2 July 2001, a 4.5-FRF (0.69-€) stamp was issued in France to celebrate Albert Caquot's legacy on the 120th anniversary of his birth and the 25th anniversary of his death. A “Caquot dirigeable" and the bridge of La Caille, two of his creations, surround his picture on the stamp.
Since 1989, the Prix Albert Caquot is awarded annually by the French Association of Civil and Structural Engineering.
- Bases cientificas del hormigón pretensado. In: Hormigón pretensado, v. 1, n. 5 (4th Quarter 1950), pp. 1-7. (1950):
- Le béton armé et ses applications. In: Annales des Ponts et Chaussées, n. 2 ( 1931), pp. 335. (1931):
- Action sur un massif, limité à un plan, d'une charge distribuée sur une droite de ce plan, normalement à celui-ci et de densité constante p par une unité de longueur. In: Annales des Ponts et Chaussées, n. 1 ( 1948), pp. 83. (1948):
- Les bases scientifiques de la précontrainte. Conférence. In: Travaux, n. 178 (August 1949), pp. 311. (1949):
- Cinquante ans de béton armé: Exposé. In: Travaux, n. 107 (May 1943), pp. 165. (1943):
- 250 ans de l'Ecole des Ponts en cent portraits. Presses de l'école nationale des Ponts et Chaussées, Paris (France), pp. 222. (1997):
- Albert Caquot. In: Bulletin annuel AFPC ( 1976- 1977), pp. 31-34.
- Albert Caquot (1881-1976). Savant, soldat et bâtisseur. Presses de l'Ecole nationale des ponts et chaussées, Paris (France), pp. 184. (2000):
- Albert Caquot (1881-1976) - Sa vie, son oeuvre. In: Annales des Ponts et Chaussées (1st Quarter 1977), pp. 8-10. (1977):
- Albert Caquot 1881-1976. Créateur et Précurseur. Editions Eyrolles, Paris (France). (1978):
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